Alignment device and manufacturing method for polymer stabilized vertical alignment liquid crystal panel

ABSTRACT

A manufacturing method for a polymer stabilized vertical alignment (PS-VA) liquid crystal panel includes: forming a first substrate of PS-VA liquid crystal panel, the first substrate including a common electrode; forming a second substrate of the PS-VA liquid crystal panel, the second substrate including a pixel electrode; forming a liquid crystal layer between the first and second substrates, the liquid crystal layer containing negative liquid crystal molecules and ultraviolet-curable resin; applying an electrical voltage that exceeds a rotation threshold of the liquid crystal layer to the common electrode and the pixel electrode; and reciprocally moving an ultraviolet light source, which is composed of at least two ultraviolet light sources that are distributed parallel to each other in a first direction and respectively extend in a second direction, in such a direction as to have accumulation of ultraviolet light received by the ultraviolet-curable resin of the liquid crystal layer homogenized.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a divisional application of co-pending U.S. patent applicationSer. No. 13/503,373, filed on Apr. 23, 2012, which is a national stageof PCT Application Number PCT/CN2012/070370, filed on Jan. 16, 2012,claiming foreign priority of Chinese Patent Application Number201110433204.0, filed on Dec. 21, 2011.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of liquid crystal displaying,and in particular to an alignment device and manufacturing method forpolymer stabilized vertical alignment (PS-VA) liquid crystal panel.

2. The Related Arts

Referring to FIGS. 1, 2, 3, and 4, FIG. 1 is a schematic view showing aconventional ultraviolet (UV) light source, FIG. 2 is a schematic viewshowing a conventional light source straight irradiating a polymerstabilized vertical alignment (PS-VA) liquid crystal panel, FIG. 3 is aschematic view showing a structure of a conventional PS-VA liquidcrystal panel, and FIG. 4 is a plot showing the relationship betweenaccumulation of ultraviolet light received by ultraviolet-curable resincontained in a conventional liquid crystal layer and position in X-Xdirection. As shown in FIG. 1, the ultraviolet light source is composedof at least two ultraviolet light sources 101. As shown in FIG. 2, alight source 201 straight irradiates a PS-VA liquid crystal panel 202.As shown in FIG. 3, a PS-VA liquid crystal panel comprises a firstsubstrate 301, a second substrate 302, a slit zone 303, liquid crystal304, and a bump 305. Since in the conventional method for manufacturingPS-VA liquid crystal panel, the light source is generally fixed when thePS-VA liquid crystal panel is subjected to exposure and since the lightsource is composed of equally-spaced ultraviolet light sources, theaccumulation of ultraviolet light received by the ultraviolet-curableresin contained in the liquid crystal layer is not constant. As shown inFIG. 4, the amount of light received by the ultraviolet-curable resinthat is located at a position corresponding to the interval between twoultraviolet light sources is relatively small, while theultraviolet-curable resin of the liquid crystal layer that is located ata position corresponding to an ultraviolet light source has a relativelylarge ultraviolet light accumulation. The different amounts of lightaccumulation cause localized displaying defects, negatively affectingthe displaying performance of a liquid crystal display device.

Thus, it is desired to have an alignment device and a manufacturingmethod for PS-VA liquid crystal panel that effectively eliminate theproblem of displaying defect found in the conventional manufacturingprocess of PS-VA liquid crystal panel.

SUMMARY OF THE INVENTION

The general technical issue to be addressed by the present invention isthe problem of displaying defect found in the conventional manufacturingprocess of polymer stabilized vertical alignment (PS-VA) liquid crystalpanel.

To address the above discussed technical issue, the present inventionadopts a technical solution, which provides an alignment device forpolymer stabilized vertical alignment liquid crystal panel. The polymerstabilized vertical alignment liquid crystal panel comprises a firstsubstrate, a second substrate, and a liquid crystal layer. The firstsubstrate comprises a common electrode. The second substrate comprises apixel electrode. The liquid crystal layer comprises negative liquidcrystal molecules and ultraviolet-curable resin. The alignment devicecomprises: a voltage application module, which applies an electricalvoltage that exceeds a rotation threshold of the liquid crystal layer tothe common electrode and the pixel electrode; a light source, whichcomprises at least two ultraviolet light sources that are distributedparallel in a first direction, the ultraviolet light sources extendingin a second direction and emitting ultraviolet lights to irradiate thepolymer stabilized vertical alignment liquid crystal panel; and a lightsource movement control module, which controls the light source toreciprocally move in such a direction as to have accumulation ofultraviolet light received by the ultraviolet-curable resin of theliquid crystal layer homogenized.

Wherein, the light source comprises multiple ultraviolet light sourcesthat are arranged in a parallel and equally spaced manner.

Wherein, the light source movement control module controls the lightsource to move in the first direction by a first predetermined distanceand to subsequently move in a direction opposite to the first directionby the first predetermined distance to return to a home position, themovements being cyclically repeatable.

Wherein, the first predetermined distance is a half of a spacingdistance between the ultraviolet light sources or a multiple of a halfof the spacing distance between the ultraviolet light sources.

Wherein, the light source movement control module controls the lightsource to move in the first direction by a second predetermined distanceand to subsequently move in a direction opposite to the first directionby a distance that is twice of the second predetermined distance and tofurther move in the first direction by the second predetermined distanceto return to a home position, the movements being cyclically repeatable.

Wherein, the second predetermined distance is a half of a spacingdistance between the ultraviolet light sources or a multiple of a halfof the spacing distance between the ultraviolet light sources.

Wherein, the alignment device further comprises a speed adjustingmodule, and the speed adjusting module is coupled to the light sourcemovement control module to supply a speed control signal to the lightsource movement control module. The speed control signal is applied toadjust moving speed of the light source.

Wherein, the alignment device further comprises a temperature controlmodule, which controls temperature of the liquid crystal layer of thepolymer stabilized vertical alignment liquid crystal panel, and asubstrate retention module, which retains the polymer stabilizedvertical alignment liquid crystal panel in position.

To address the above discussed technical issue, the present inventionadopts a technical solution, which provides a method for manufacturingpolymer stabilized vertical alignment liquid crystal panel. The methodcomprises: forming a first substrate of polymer stabilized verticalalignment liquid crystal panel, wherein the first substrate comprises acommon electrode; forming a second substrate of the polymer stabilizedvertical alignment liquid crystal panel, wherein the second substratecomprises a pixel electrode; forming a liquid crystal layer between thefirst substrate and the second substrate, wherein the liquid crystallayer comprises negative liquid crystal molecules andultraviolet-curable resin; applying an electrical voltage that exceeds arotation threshold of the liquid crystal layer to the common electrodeand the pixel electrode; and reciprocally moving an ultraviolet lightsource, which is composed of at least two ultraviolet light sources thatare distributed parallel to each other in a first direction andrespectively extend in a second direction, in such a direction as tohave accumulation of ultraviolet light received by theultraviolet-curable resin of the liquid crystal layer homogenized.

Wherein, the step of reciprocally moving an ultraviolet light source,which is composed of multiple ultraviolet light sources that aredistributed in a parallel and equally spaced manner in a first directionand extend in a second direction, in such a direction as to haveaccumulation of ultraviolet light received by the ultraviolet-curableresin of the liquid crystal layer homogenized comprises: moving theultraviolet light source, which is composed of at least two ultravioletlight sources that are distributed parallel to each other in a firstdirection and respectively extend in a second direction, in the firstdirection by a first predetermined distance and subsequently moving in adirection opposite to the first direction by the first predetermineddistance to return to a home position, the movements being cyclicallyrepeatable.

Wherein, the step of reciprocally moving an ultraviolet light source,which is composed of multiple ultraviolet light sources that aredistributed in a parallel and equally spaced manner in a first directionand extend in a second direction, in such a direction as to haveaccumulation of ultraviolet light received by the ultraviolet-curableresin of the liquid crystal layer homogenized comprises: moving theultraviolet light source, which is composed of at least two ultravioletlight sources that are distributed parallel to each other in a firstdirection and respectively extend in a second direction, in the firstdirection by a half of a spacing distance between the ultraviolet lightsources or a multiple of a half of the spacing distance between theultraviolet light sources and subsequently moving in a directionopposite to the first direction by a half of a spacing distance betweenthe ultraviolet light sources or a multiple of a half of the spacingdistance between the ultraviolet light sources to return to a homeposition, the movements being cyclically repeatable.

Wherein, the step of reciprocally moving an ultraviolet light source,which is composed of multiple ultraviolet light sources that aredistributed in a parallel and equally spaced manner in a first directionand extend in a second direction, in such a direction as to haveaccumulation of ultraviolet light received by the ultraviolet-curableresin of the liquid crystal layer homogenized comprises: moving theultraviolet light source, which is composed of at least two ultravioletlight sources that are distributed parallel to each other in a firstdirection and respectively extend in a second direction, in the firstdirection by a second predetermined distance and subsequently moving ina direction opposite to the first direction by a distance that is twiceof the second predetermined distance and further moving in the firstdirection by the second predetermined distance to return to a homeposition, the movements being cyclically repeatable.

Wherein, the step of reciprocally moving an ultraviolet light source,which is composed of multiple ultraviolet light sources that aredistributed in a parallel and equally spaced manner in a first directionand extend in a second direction, in such a direction as to haveaccumulation of ultraviolet light received by the ultraviolet-curableresin of the liquid crystal layer homogenized comprises: moving theultraviolet light source, which is composed of at least two ultravioletlight sources that are distributed parallel to each other in a firstdirection and respectively extend in a second direction, in the firstdirection by a half of a spacing distance between the ultraviolet lightsources or a multiple of a half of the spacing distance between theultraviolet light sources and subsequently moving in a directionopposite to the first direction by a distance that is twice of a half ofa spacing distance between the ultraviolet light sources or a multipleof a half of the spacing distance between the ultraviolet light sourcesand further moving in the first direction by a half of a spacingdistance between the ultraviolet light sources or a multiple of a halfof the spacing distance between the ultraviolet light sources to returnto a home position, the movements being cyclically repeatable.

Wherein, the method comprises: controlling temperature of the liquidcrystal layer of the polymer stabilized vertical alignment liquidcrystal panel in manufacturing process.

Wherein, the method comprises: adjusting a moving speed of the lightsource.

Wherein, the method comprises: retaining the polymer stabilized verticalalignment liquid crystal panel in position.

The efficacy of the present invention is that to be distinguished fromthe state of the art, the alignment device and manufacturing method forliquid crystal display device according to the present invention makeuse of moving light source to homogenize the accumulation of lightreceived by ultraviolet-curable resin contained in a liquid crystallayer so that displaying defects generated due to non-uniformaccumulation of light received in PS-VA liquid crystal panel can beavoided, rate of success for manufacturing PS-VA liquid crystal panel isincreased, quality of PS-VA liquid crystal panel is improved, the chanceof poor or degraded product is reduced, and thus the cost can beindirectly lowered down.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a conventional ultraviolet (UV) lightsource;

FIG. 2 is a schematic view showing a conventional light source straightirradiating a polymer stabilized vertical alignment (PS-VA) liquidcrystal panel;

FIG. 3 is a schematic view showing a structure of a conventional PS-VAliquid crystal panel;

FIG. 4 is a plot showing the relationship between accumulation ofultraviolet light received by ultraviolet-curable resin contained in aconventional liquid crystal layer and position in X-X direction;

FIG. 5 is a flow chart illustrating a manufacturing method for PS-VAliquid crystal panel according to an embodiment of the presentinvention;

FIG. 6 is a plot showing the relationship between displacement of lightsource and time coordinate according to a first embodiment of thepresent invention;

FIG. 7 is a plot showing the relationship between displacement of lightsource and time coordinate according to a second embodiment of thepresent invention;

FIG. 8 is a plot showing the relationship between displacement of lightsource and time coordinate according to a third embodiment of thepresent invention;

FIG. 9 is a plot showing the relationship between displacement of lightsource and time coordinate according to a fourth embodiment of thepresent invention;

FIG. 10 is a schematic view showing a light source obliquely irradiatinga PS-VA liquid crystal panel according to an embodiment of the presentinvention; and

FIG. 11 is a schematic view showing an alignment device for the PS-VAliquid crystal panel according to an embodiment of the presentinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 5 and 3, FIG. 5 is a flow chart illustrating amanufacturing method for polymer stabilized vertical alignment (PS-VA)liquid crystal panel according to an embodiment of the present inventionand FIG. 3 is a schematic view showing a structure of a PS-VA liquidcrystal panel. As shown in FIG. 5, the method for manufacturing PS-VAliquid crystal panel comprises the following steps:

Step S1: forming a first substrate of PS-VA liquid crystal panel,wherein the first substrate comprises a common electrode;

Step S2: forming a second substrate of the PS-VA liquid crystal panel,wherein the second substrate comprises a pixel electrode;

Step S3: forming a liquid crystal layer between the first substrate andthe second substrate, wherein the liquid crystal layer comprisesnegative liquid crystal molecules and ultraviolet-curable resin;

wherein as shown in FIG. 3, in the instant embodiment, the firstsubstrate and the second substrate are both a glass substrate and a bump305 is formed on the first substrate and a slit zone 303 is provided,the slit zone 303 constraining the tilt direction of the liquid crystalmolecules by inducing an electrical field; and

the ultraviolet-curable resin is attached to the negative liquid crystalmolecules, whereby the ultraviolet-curable resin, when receivingirradiation of ultraviolet light, tilts the negative liquid crystalmolecules to which it is attached so that the negative liquid crystalmolecules of the liquid crystal layer can be tilted through irradiationof ultraviolet light;

Step S4: applying electrical voltages that exceed rotation threshold ofliquid crystal layer to a common electrode and a pixel electrode;

wherein upon a sudden application of high voltage, electrostatic energycauses liquid crystal molecules to randomly tilt and the liquid crystalmolecules that tilt in a direction opposite to the direction in whichthe liquid crystal molecules are supposed to tilt will attempt tomaintain tilting in the correct direction, for in the point of view ofenergy the liquid crystal molecules that tilt in the opposite directionare unstable; to maintain tilting in the correct direction requires theliquid crystal molecules to consume a great amount of energy and in sucha process, the liquid crystal molecules must overcome the electrostaticenergy for if the liquid crystal molecules cannot overcome theelectrostatic energy, the liquid crystal molecules that tilt in theopposite direction would enter a metastable state and stay in such astate; however, an application of a voltage slightly greater than thethreshold would cause the liquid crystal molecules that tilt in theopposite direction to overcome the electrostatic energy through a smallamount of elastic energy to maintain tilting in the correct direction;and once the liquid crystal molecules get tilting in the correctdirection, they no longer tilt in the opposite direction when thevoltage is raised; and

Step S5: reciprocally moving an ultraviolet light source, which iscomposed of at least two ultraviolet light sources that are distributedparallel to each other in a first direction and respectively extend in asecond direction, in such a direction as to have the accumulation ofultraviolet light received by the ultraviolet-curable resin of theliquid crystal layer homogenized.

In the instant embodiment, the step of reciprocally moving theultraviolet light source that is composed of at least two parallelarranged ultraviolet light sources in such a direction as to have theaccumulation of ultraviolet light received by the ultraviolet-curableresin of the liquid crystal layer homogenized can be carried out invarious ways according to different conditions. A detailed descriptionwill be given below with reference to several embodiments.

Referring to FIGS. 2 and 6, FIG. 2 is a schematic view showing aconventional light source straight irradiating a PS-VA liquid crystalpanel and FIG. 6 is a plot showing the relationship between displacementof light source and time coordinate according to a first embodiment ofthe present invention. As shown in FIGS. 2 and 6, in the firstembodiment, a light source is first displaced by a distance a in a firstdirection, namely X-X direction, which is a direction perpendicular tothe direction of ultraviolet light source on the plane where theultraviolet light source is located, and is then displaced in a reversedor opposite direction by a distance a and this process is cyclicallyrepeated. In the first embodiment, since the ultraviolet light sourceused is a light source composed of at least two parallel and equallyspaced ultraviolet light sources, the distance a is half the spacingdistance or interval between the two ultraviolet light sources. Throughthe above way, the relative position of each spot of the PS-VA liquidcrystal panel with respect to the light source is constantly varied andthe variation is regular and consistent for each spot, so that theaccumulation of light received in each spot is made uniform.

Referring to FIGS. 2 and 7, FIG. 2 is a schematic view showing aconventional straight light source irradiating a PS-VA liquid crystalpanel and FIG. 7 is a plot showing the relationship between displacementof light source and time coordinate according to a second embodiment ofthe present invention. As shown in FIGS. 2 and 7, in the secondembodiment, a light source is first displaced by a distance b in a firstdirection, namely X-X direction, which is a direction perpendicular tothe direction of ultraviolet light source on the plane where theultraviolet light source is located, and is then displaced in a reversedor opposite direction by a distance b and this process is cyclicallyrepeated.

In the second embodiment, the displacement distance b is the spacingdistance between the two ultraviolet light sources.

In other embodiments, the same way of displacement as those of the firstand second embodiments is adopted and the displacement distance can be amultiple of half the spacing distance between two ultraviolet lightsources in order to eliminate the difficult of operation caused byexcessively small spacing distance resulting from over-dense arrangementof the ultraviolet light sources.

In other embodiments, the displacement distance used is not a multipleof half the spacing distance between two ultraviolet light sources.Although those other displacement distances do not provide the optimumresult, yet a certain extent of homogenization of the accumulation ofultraviolet light received by the ultraviolet-curable resin contained inthe liquid crystal layer can be achieved.

Referring to FIGS. 2 and 8, FIG. 2 is a schematic view showing aconventional straight light source irradiating a PS-VA liquid crystalpanel and FIG. 8 is a plot showing the relationship between displacementof light source and time coordinate according to a third embodiment ofthe present invention. As shown in FIGS. 2 and 8, in the thirdembodiment, a light source is first displaced by a distance c in a firstdirection, namely X-X direction, which is a direction perpendicular tothe direction of ultraviolet light source on the plane where theultraviolet light source is located, and is then displaced in a reversedor opposite direction by a distance 2 c, and is displaced again in theX-X direction by a distance c and this process is cyclically repeated.The operation principle of the third embodiment is generally similar tothose of the first and second embodiments, but the way of cyclicallyrepeated displacement adopted in the third embodiment is morecomplicated than those of the first and second embodiment. Since thedisplacement distance of each move is made longer, the error occurringin each cycle shows reduced influence on the whole cycle.

In the third embodiment, the distance c is half the spacing distance orinterval between two ultraviolet light sources.

Referring to FIGS. 2 and 9, FIG. 2 is a schematic view showing aconventional straight light source irradiating a PS-VA liquid crystalpanel and FIG. 9 is a plot showing the relationship between displacementof light source and time coordinate according to a fourth embodiment ofthe present invention. As shown in FIGS. 2 and 9, in the fourthembodiment, a light source is first displaced by a distance d in a firstdirection, namely X-X direction, which is a direction perpendicular tothe direction of ultraviolet light source on the plane where theultraviolet light source is located, and is then displaced in a reversedor opposite direction by a distance 2 d and is displaced again in theX-X direction by a distance d and this process is cyclically repeated.

In the fourth embodiment, the displacement distance d is the spacingdistance between two ultraviolet light sources.

In other embodiments, the same way of displacement as those of the thirdand fourth embodiments is adopted and the displacement distance can be amultiple of half the spacing distance between two ultraviolet lightsources to serve as a new displacement distance.

In other embodiments, the displacement distance used is not a multipleof half the spacing distance between two ultraviolet light sources.Although those other displacement distances do not provide the optimumresult, yet a certain extent of homogenization of the accumulation ofultraviolet light received by the ultraviolet-curable resin contained inthe liquid crystal layer can be achieved.

In the above discussed first, second, third, and fourth embodiment, thelight source is arranged to provide straight irradiation and in thefollowing, a description will be given for practicing the presentinvention with oblique irradiation of light source.

Referring to FIG. 10, FIG. 10 is a schematic view showing a light sourceobliquely irradiating a PS-VA liquid crystal panel according to anembodiment of the present invention. As shown in FIG. 10, a light source1001 obliquely irradiates a PS-VA liquid crystal panel 1002. The light1001 that is irradiated in an oblique manner causes a relatively largelight accumulation received by the ultraviolet-curable resin that iscontained in the liquid crystal layer at a location close to the lightsource, while the ultraviolet-curable resin that is contained in theliquid crystal layer at a location remote from the light source 1001receives a relatively small amount of light accumulation. Under thiscondition, the accumulation of light received by the ultraviolet-curableresin contained in the liquid crystal layer can be made similar to thatreceived in the case straight irradiation by adjusting the lightintensity of each ultraviolet light source. In other words, theintensity of the light source that is close to the liquid crystal panelis made weak, while the intensity of the ultraviolet light source thatis remote from the liquid crystal panel is made strong. Through such anarrangement, the oblique irradiation is in fact the same as the straightirradiation. Then, the way of displacement according to the presentinvention may be performed with the displacement distance properlyvaried according to certain factors, such as the angle of oblique. Theabove described processing with oblique irradiation and the variation ofthe displacement distance can be carried out in various ways and theycan be readily appreciated by those skilled in the art based on thedisclosure and the public knowledge of this field and consideredbelonging to the protection scope of the present invention. Furtherdetail will not be repeated here.

In the instant embodiment, the operation is performed by such a way thatthe PS-VA liquid crystal panel is fixed, whereby in the process ofirradiation, only the light source is moved and the PS-VA liquid crystalpanel is kept stationary or fixed in position. This way makescontrolling the relative movement between the light source and the PS-VAliquid crystal panel easier than the case that both the light source andthe PS-VA liquid crystal panel are moved and is applicable to a case ofrelatively simple movement.

In other embodiments, based on practical needs, it is possible to makethe PS-VA liquid crystal panel movable in order to effect simplificationof certain complicated relative motions.

In the instant embodiment, different PS-VA liquid crystal panels anddifferent requirements of product may need the PS-VA liquid crystalpanels to be set at different temperature during the process ofirradiation. After the initial adjustment of the surface temperature ofthe PS-VA liquid crystal panel is completed, the PS-VA liquid crystalpanel may subsequently kept at such a temperature or the temperature maybe varied as desired.

In the instant embodiment, the light source may have a moving speed thatis adjustable and the speed may be adjusted from time to time in orderto meet the needs of different requirements to control the light sourcefor making a constant speed motion or a variable speed motion.

Referring to FIG. 11, FIG. 11 is a schematic view showing an alignmentdevice for the PS-VA liquid crystal panel according to an embodiment ofthe present invention. As shown in FIG. 11, the alignment device 110 forPS-VA liquid crystal panel comprises: a light source 1101, whichcomprises at least two ultraviolet light sources that are distributedparallel in a first direction, the ultraviolet light sources extendingin a second direction and emitting ultraviolet lights to irradiate aPS-VA liquid crystal panel; a light source movement control module 1102,which controls the light source to reciprocally move in such a directionas to have the light accumulation of ultraviolet light received byultraviolet-curable resin contained in a liquid crystal layerhomogenized; a speed adjusting module 1103, which is coupled to thelight source movement control module to supply a speed control signal tothe light source movement control module, the speed control signal beingapplied to adjust moving speed of the light source; a voltageapplication module 1104, which applies an electrical voltage thatexceeds a rotation threshold of the liquid crystal layer to a commonelectrode and a pixel electrode; a temperature control module 1105,which controls the temperature of the liquid crystal layer of the PS-VAliquid crystal panel; and a substrate retention module 1106, whichretains the PS-VA liquid crystal panel in position.

In the instant embodiment, the light source movement control module 1102allows a user to parameters of a movement mode, such as moving distance,the way of cyclically repeating, and the likes. The light sourcemovement control module 1102 may store various movement modes and theuse may is allowed to select a desired movement mode according to his orher needs or the user is allowed to store the movement mode set byhimself or herself.

In the instant embodiment, the speed adjusting module 1103 may controlthe moving speed of the light source 1101 and the speed adjusting module1103 may control the light source 1101 to carry out constant speedmotion or variable speed motion, or to change the moving speed in thecourse of movement. Through the coordinated cooperation between thespeed adjusting module 1103 and the movement module 1102, the lightsource 1101 can be controlled to take various modes of movement in orderto meet the needs.

In the instant embodiment, the temperature control module 1105 controlthe temperature of the liquid crystal layer of the PS-VA liquid crystalpanel. The temperature of the PS-VA liquid crystal panel during theprocess of irradiation is of great influence on the manufacture of PS-VAliquid crystal panel. The temperature control module may initially setthe temperature of the PS-VA liquid crystal panel at the beginning andthen just monitors the temperature of the PS-VA liquid crystal panelduring the process of irradiation and makes necessary adjustment inorder to prevent the quality of the PS-VA liquid crystal panel frombeing affected by temperature variation occurring in the substrate dueto light irradiation.

The operation process and operation principle of the alignment device110 for PS-VA liquid crystal panel may be referred to the abovedescription regarding the manufacturing method for PS-VA liquid crystalpanel and repeated description will not be given.

In summary, the alignment device and manufacturing method for liquidcrystal display device according to the present invention make use ofmoving light source to homogenize the accumulation of light received byultraviolet-curable resin contained in a liquid crystal layer so thatdisplaying defects caused by non-uniform accumulation of light can beavoided, rate of success for manufacturing PS-VA liquid crystal panel isincreased, quality of PS-VA liquid crystal panel is improved, the chanceof poor or degraded product is reduced, and thus the cost can beindirectly lowered down.

Embodiments of the present invention have been described, but notintending to impose any unduly constraint to the appended claims. Anymodification of equivalent structure or equivalent process madeaccording to the disclosure and drawings of the present invention, orany application thereof, directly or indirectly, to other related fieldsof technique, is considered encompassed in the scope of protectiondefined by the clams of the present invention.

What is claimed is:
 1. A method for manufacturing a polymer stabilizedvertical alignment liquid crystal panel, wherein the method comprisesthe following steps: forming a first substrate of polymer stabilizedvertical alignment liquid crystal panel, wherein the first substratecomprises a common electrode; forming a second substrate of the polymerstabilized vertical alignment liquid crystal panel, wherein the secondsubstrate comprises a pixel electrode; forming a liquid crystal layerbetween the first substrate and the second substrate, wherein the liquidcrystal layer comprises negative liquid crystal molecules andultraviolet-curable resin; applying an electrical voltage that exceeds arotation threshold of the liquid crystal layer to the common electrodeand the pixel electrode; providing a light source which comprises atleast two second ultraviolet light sources distributed parallel to eachother in a first direction that is inclined with respect to the polymerstabilized vertical alignment liquid crystal panel and respectivelyextend in a second direction, and locating the at least two secondultraviolet light sources in positions such that a first one of the twosecond ultraviolet light sources is spaced from the polymer stabilizedvertical alignment liquid crystal panel by a first distance while asecond one of the two second ultraviolet light sources is spaced fromthe polymer stabilized vertical alignment liquid crystal panel by asecond distance that is greater than the first distance; wherein thefirst one of the two second ultraviolet light sources emits ultravioletlight at a first intensity and the second one of the two secondultraviolet light sources emits light at a second intensity that isgreater than the first intensity; and reciprocally moving the lightsource in such a direction as to have accumulation of ultraviolet lightreceived by the ultraviolet-curable resin of the liquid crystal layerhomogenized.
 2. The method as claimed in claim 1, wherein the methodcomprises: controlling temperature of the liquid crystal layer of thepolymer stabilized vertical alignment liquid crystal panel inmanufacturing process.
 3. The method as claimed in claim 1, wherein themethod comprises: adjusting a moving speed of the light source.
 4. Themethod as claimed in claim 1, wherein the method comprises: retainingthe polymer stabilized vertical alignment liquid crystal panel inposition.
 5. The method as claimed in claim 1, wherein the step ofreciprocally moving the light source in such a direction as to haveaccumulation of ultraviolet light received by the ultraviolet-curableresin of the liquid crystal layer homogenized comprises: moving theultraviolet light source, which is composed of at least two ultravioletlight sources that are distributed parallel to each other in a firstdirection and respectively extend in a second direction, in the firstdirection by a first predetermined distance and subsequently moving in adirection opposite to the first direction by the first predetermineddistance to return to a home position, the movements being cyclicallyrepeatable.
 6. The method as claimed in claim 1, wherein the step ofreciprocally moving the light source in such a direction as to haveaccumulation of ultraviolet light received by the ultraviolet-curableresin of the liquid crystal layer homogenized comprises: moving theultraviolet light source, which is composed of at least two ultravioletlight sources that are distributed parallel to each other in a firstdirection and respectively extend in a second direction, in the firstdirection by a half of a spacing distance between the ultraviolet lightsources or a multiple of a half of the spacing distance between theultraviolet light sources and subsequently moving in a directionopposite to the first direction by a half of a spacing distance betweenthe ultraviolet light sources or a multiple of a half of the spacingdistance between the ultraviolet light sources to return to a homeposition, the movements being cyclically repeatable.
 7. The method asclaimed in claim 1, wherein the step of reciprocally moving the lightsource in such a direction as to have accumulation of ultraviolet lightreceived by the ultraviolet-curable resin of the liquid crystal layerhomogenized comprises: moving the ultraviolet light source, which iscomposed of at least two ultraviolet light sources that are distributedparallel to each other in a first direction and respectively extend in asecond direction, in the first direction by a second predetermineddistance and subsequently moving in a direction opposite to the firstdirection by a distance that is twice of the second predetermineddistance and further moving in the first direction by the secondpredetermined distance to return to a home position, the movements beingcyclically repeatable.
 8. The method as claimed in claim 1, wherein thestep of reciprocally moving the light source in such a direction as tohave accumulation of ultraviolet light received by theultraviolet-curable resin of the liquid crystal layer homogenizedcomprises: moving the ultraviolet light source, which is composed of atleast two ultraviolet light sources that are distributed parallel toeach other in a first direction and respectively extend in a seconddirection, in the first direction by a half of a spacing distancebetween the ultraviolet light sources or a multiple of a half of thespacing distance between the ultraviolet light sources and subsequentlymoving in a direction opposite to the first direction by a distance thatis twice of a half of a spacing distance between the ultraviolet lightsources or a multiple of a half of the spacing distance between theultraviolet light sources and further moving in the first direction by ahalf of a spacing distance between the ultraviolet light sources or amultiple of a half of the spacing distance between the ultraviolet lightsources to return to a home position, the movements being cyclicallyrepeatable.